托福阅读修辞目的题是阅读考试中比较常见的一种题型，tpo则是托福阅读备考最权威的材料，所以托福小编综合二者，为大家集中整理了tpo阅读中考察的修辞目的题及其对应的解析，供大家参考使用。本文带来的是TPO27-3的修辞目的题，一起来看看吧。
TPO27-3 Predator-Prey Cycles
Paragraph 1: How do predators affect populations of the prey animals? The answer is not as simple as might be thought. Moose reached Isle Royale in Lake Superior by crossing over winter ice and multiplied freely there in isolation without predators. When wolves later reached the island, naturalists widely assumed that the wolves would play a key role in controlling the moose population. Careful studies have demonstrated, however, that this is not the case. The wolves eat mostly old or diseased animals that would not survive long anyway. In general, the moose population is controlled by food availability, disease and other factors rather than by wolves.
1.In paragraph 1, why does the author discuss the moose and wolves on Isle Royale?
O To provide an example of predators moving to new habitats by following migrating prey
O To show that the interactions between predator populations and prey populations are not always might be expected
O To suggest that prey populations are more influenced by predation than food availability and disease
O To argue that studies of geographically isolated populations tend not to be useful to naturalists
1.B
对应文章的第四句，Careful studies…not the case.这句话前面说人们觉得狼对控制鹿的数量控制起到了重要作用，这句话对其进行了否定，对应了B选项。A与原文没有关系。C与原文第一段最后一句话矛盾。D也不对。
段落翻译：
1 捕食者是怎样影响被捕食者的数量呢?答案并不是想象中那么简单。麋鹿通过穿越冬天的冰层到达了在苏必略湖的罗亚尔岛，并由于没有捕食者而自由繁殖。当狼在晚一点的时候到达那座岛时，自然学家都认为，狼对控制麋鹿的数量将起到关键作用。但是，严密的研究说明并不是这样。狼吃掉的大部分是年老的，或生病的动物，他们本身就不会存活很久。一般地，麋鹿的数量是由食物、疾病、和其它的一些条件，而不是狼控制的。
以上就是托福阅读TPO27-3中的修辞目的题及其解析，大家可以在备考的时候参考复习，希望能够帮助大家的考前准备。最后前程百利祝大家都能取得理想的托福考试成绩。
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